/**
 * Copyright (C) 2013-2024 Nanjing Pengyun Network Technology Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 
#ifndef _LINUX_LIST_H
#define _LINUX_LIST_H

#define prefetch(x) 1

#define smp_wmb(x)     1

#define LIST_POISON1  ((void *) NULL)
#define LIST_POISON2  ((void *) NULL)

#define list_sort(ptr, ptr_function) ({ \
    struct list_head * head_ptr = (ptr); \
    struct list_head * begin_ptr = head_ptr ; \
    struct list_head * end_ptr = head_ptr->prev ; \
    struct list_head * cur_ptr = NULL ; \
    struct list_head * min_ptr = NULL ; \
    if(NULL != head_ptr || NULL != ptr_function) \
    {    \
        if(!list_empty_careful(head_ptr)) \
        { \
            begin_ptr = head_ptr->next ; \
            end_ptr = head_ptr->prev ; \
            while(begin_ptr != end_ptr) \
            { \
                min_ptr = end_ptr ; \
                cur_ptr = end_ptr->prev ; \
                while(cur_ptr != begin_ptr) \
                { \
                    if(ptr_function(min_ptr, cur_ptr) > 0) \
                    { \
                        min_ptr = cur_ptr ; \
                    }    \
                    cur_ptr = cur_ptr->prev ; \
                } \
                if(ptr_function(begin_ptr, min_ptr) > 0) \
                { \
                    cur_ptr = begin_ptr->next;\
                    list_swap(begin_ptr, min_ptr) ; \
                    begin_ptr = cur_ptr ; \
                } \
                else \
                { \
                    begin_ptr = begin_ptr->next ; \
                }  \
                end_ptr = head_ptr->prev ;       \
            } \
        } \
    } \
})

#define list_free(ptr, free_function) ({ \
    struct list_head * head_ptr = (ptr); \
    struct list_head * cur_ptr = head_ptr->prev ; \
    struct list_head * free_ptr = NULL ; \
    if(NULL != head_ptr || NULL != free_function) \
    {    \
        while(cur_ptr != head_ptr) \
        {\
            free_ptr = cur_ptr ; \
            cur_ptr = cur_ptr->prev ; \
            __list_del(free_ptr->prev, free_ptr->next) ; \
            free_function(free_ptr) ; \
            free_ptr = NULL ; \
        } \
    } \
})

#define list_offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

#define container_of(ptr, type, member) ({ \
        const typeof( ((type *)0)->member ) *__mptr = (ptr); \
        (type *)( (char *)__mptr - list_offsetof(type,member) );})
        

struct list_head {
	struct list_head *next, *prev;
};

#define LIST_HEAD_INIT(name) { &(name), &(name) }

#define LIST_HEAD(name) \
	struct list_head name = LIST_HEAD_INIT(name)

static inline void INIT_LIST_HEAD(struct list_head *list)
{
	list->next = list;
	list->prev = list;
}

#ifndef CONFIG_DEBUG_LIST
static inline void __list_add(struct list_head *new,
			      struct list_head *prev,
			      struct list_head *next)
{
	next->prev = new;
	new->next = next;
	new->prev = prev;
	prev->next = new;
}
#else
extern void __list_add(struct list_head *new,
			      struct list_head *prev,
			      struct list_head *next);
#endif

#ifndef CONFIG_DEBUG_LIST
static inline void list_add(struct list_head *new, struct list_head *head)
{
	__list_add(new, head, head->next);
}
#else
extern void list_add(struct list_head *new, struct list_head *head);
#endif

static inline void list_add_tail(struct list_head *new, struct list_head *head)
{
	__list_add(new, head->prev, head);
}

static inline void __list_add_rcu(struct list_head * new,
		struct list_head * prev, struct list_head * next)
{
	new->next = next;
	new->prev = prev;
	smp_wmb();
	next->prev = new;
	prev->next = new;
}

static inline void list_add_rcu(struct list_head *new, struct list_head *head)
{
	__list_add_rcu(new, head, head->next);
}

static inline void list_add_tail_rcu(struct list_head *new,
					struct list_head *head)
{
	__list_add_rcu(new, head->prev, head);
}

static inline void __list_del(struct list_head * prev, struct list_head * next)
{
	next->prev = prev;
	prev->next = next;
}

#ifndef CONFIG_DEBUG_LIST
static inline void list_del(struct list_head *entry)
{
	__list_del(entry->prev, entry->next);
	entry->next = LIST_POISON1;
	entry->prev = LIST_POISON2;
}
#else
extern void list_del(struct list_head *entry);
#endif

static inline void list_del_rcu(struct list_head *entry)
{
	__list_del(entry->prev, entry->next);
	entry->prev = LIST_POISON2;
}

static inline void list_replace(struct list_head *old,
				struct list_head *new)
{
	new->next = old->next;
	new->next->prev = new;
	new->prev = old->prev;
	new->prev->next = new;
}

static inline int list_swap(struct list_head *tmp1,
				struct list_head *tmp2)
{
    struct list_head * tmp1_next = NULL ;
    struct list_head * tmp1_prev = NULL ;
    struct list_head * tmp2_next = NULL ;
    struct list_head * tmp2_prev = NULL ;
    
    
   
    if(NULL == tmp1 || NULL == tmp2)
    {
        return 1;
    }    
    

    tmp1_next = tmp1->next ;
    tmp1_prev = tmp1->prev ;

    tmp2_next = tmp2->next ;
    tmp2_prev = tmp2->prev ;
    
    if(tmp1 == tmp2)
    {
        return 0 ;   
    }    
    else if(tmp1->next == tmp2 && tmp1->prev == tmp2)
    {
        return 0 ;
    }    
    else if(tmp1->next == tmp2 && tmp1->prev != tmp2) 
    {

        tmp1_prev->next = tmp2 ;
        tmp2->prev = tmp1_prev ;
        tmp2->next = tmp1 ;
        tmp1->prev = tmp2 ;
        tmp1->next = tmp2_next ;
        tmp2_next->prev = tmp1 ;
    }  
    else if(tmp1->prev == tmp2 && tmp1->next != tmp2) 
    {

        tmp2_prev->next = tmp1 ;
        tmp1->prev = tmp2_prev ;
        tmp1->next = tmp2 ;
        tmp2->prev = tmp1 ;
        tmp2->next = tmp1_next ;
        tmp1_next->prev = tmp2 ;
    }              
    else
    {            

        tmp1_prev->next = tmp2 ;
        tmp2->prev = tmp1_prev ;
        tmp2->next = tmp1_next ;
        tmp1_next->prev = tmp2 ;
        

        tmp2_prev->next = tmp1 ;
        tmp1->prev = tmp2_prev ;
        tmp2_next->prev = tmp1 ;
        tmp1->next = tmp2_next ;
    }
    return 0 ;
    	
}

static inline void list_replace_init(struct list_head *old,
					struct list_head *new)
{
	list_replace(old, new);
	INIT_LIST_HEAD(old);
}

static inline void list_replace_rcu(struct list_head *old,
				struct list_head *new)
{
	new->next = old->next;
	new->prev = old->prev;
	smp_wmb();
	new->next->prev = new;
	new->prev->next = new;
	old->prev = LIST_POISON2;
}

static inline void list_del_init(struct list_head *entry)
{
	__list_del(entry->prev, entry->next);
	INIT_LIST_HEAD(entry);
}

static inline void list_move(struct list_head *list, struct list_head *head)
{
        __list_del(list->prev, list->next);
        list_add(list, head);
}

static inline void list_move_tail(struct list_head *list,
				  struct list_head *head)
{
        __list_del(list->prev, list->next);
        list_add_tail(list, head);
}

static inline int list_is_last(const struct list_head *list,
				const struct list_head *head)
{
	return list->next == head;
}

static inline int list_empty(const struct list_head *head)
{
	return head->next == head;
}

static inline int list_empty_careful(const struct list_head *head)
{
	struct list_head *next = head->next;
	return (next == head) && (next == head->prev);
}

static inline void __list_splice(struct list_head *list,
				 struct list_head *head)
{
	struct list_head *first = list->next;
	struct list_head *last = list->prev;
	struct list_head *at = head->next;

	first->prev = head;
	head->next = first;

	last->next = at;
	at->prev = last;
}

static inline void list_splice(struct list_head *list, struct list_head *head)
{
	if (!list_empty(list))
		__list_splice(list, head);
}

static inline void list_splice_init(struct list_head *list,
				    struct list_head *head)
{
	if (!list_empty(list)) {
		__list_splice(list, head);
		INIT_LIST_HEAD(list);
	}
}

#define list_entry(ptr, type, member) \
	container_of(ptr, type, member)

#define list_for_each(pos, head) \
	for (pos = (head)->next; prefetch(pos->next), pos != (head); \
        	pos = pos->next)
        	

#define __list_for_each(pos, head) \
	for (pos = (head)->next; pos != (head); pos = pos->next)

#define list_for_each_prev(pos, head) \
	for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \
        	pos = pos->prev)

#define list_for_each_safe(pos, n, head) \
	for (pos = (head)->next, n = pos->next; pos != (head); \
		pos = n, n = pos->next)

#define list_for_each_entry(pos, head, member)				\
	for (pos = list_entry((head)->next, typeof(*pos), member);	\
	     prefetch(pos->member.next), &pos->member != (head); 	\
	     pos = list_entry(pos->member.next, typeof(*pos), member))

#define list_for_each_entry_reverse(pos, head, member)			\
	for (pos = list_entry((head)->prev, typeof(*pos), member);	\
	     prefetch(pos->member.prev), &pos->member != (head); 	\
	     pos = list_entry(pos->member.prev, typeof(*pos), member))

#define list_prepare_entry(pos, head, member) \
	((pos) ? : list_entry(head, typeof(*pos), member))

#define list_for_each_entry_continue(pos, head, member) 		\
	for (pos = list_entry(pos->member.next, typeof(*pos), member);	\
	     prefetch(pos->member.next), &pos->member != (head);	\
	     pos = list_entry(pos->member.next, typeof(*pos), member))

#define list_for_each_entry_from(pos, head, member) 			\
	for (; prefetch(pos->member.next), &pos->member != (head);	\
	     pos = list_entry(pos->member.next, typeof(*pos), member))

#define list_for_each_entry_safe(pos, n, head, member)			\
	for (pos = list_entry((head)->next, typeof(*pos), member),	\
		n = list_entry(pos->member.next, typeof(*pos), member);	\
	     &pos->member != (head); 					\
	     pos = n, n = list_entry(n->member.next, typeof(*n), member))

#define list_for_each_entry_safe_continue(pos, n, head, member) 		\
	for (pos = list_entry(pos->member.next, typeof(*pos), member), 		\
		n = list_entry(pos->member.next, typeof(*pos), member);		\
	     &pos->member != (head);						\
	     pos = n, n = list_entry(n->member.next, typeof(*n), member))

#define list_for_each_entry_safe_from(pos, n, head, member) 			\
	for (n = list_entry(pos->member.next, typeof(*pos), member);		\
	     &pos->member != (head);						\
	     pos = n, n = list_entry(n->member.next, typeof(*n), member))

#define list_for_each_entry_safe_reverse(pos, n, head, member)		\
	for (pos = list_entry((head)->prev, typeof(*pos), member),	\
		n = list_entry(pos->member.prev, typeof(*pos), member);	\
	     &pos->member != (head); 					\
	     pos = n, n = list_entry(n->member.prev, typeof(*n), member))

#define list_for_each_rcu(pos, head) \
	for (pos = (head)->next; \
		prefetch(rcu_dereference(pos)->next), pos != (head); \
        	pos = pos->next)

#define __list_for_each_rcu(pos, head) \
	for (pos = (head)->next; \
		rcu_dereference(pos) != (head); \
        	pos = pos->next)

#define list_for_each_safe_rcu(pos, n, head) \
	for (pos = (head)->next; \
		n = rcu_dereference(pos)->next, pos != (head); \
		pos = n)

#define list_for_each_entry_rcu(pos, head, member) \
	for (pos = list_entry((head)->next, typeof(*pos), member); \
		prefetch(rcu_dereference(pos)->member.next), \
			&pos->member != (head); \
		pos = list_entry(pos->member.next, typeof(*pos), member))

#define list_for_each_continue_rcu(pos, head) \
	for ((pos) = (pos)->next; \
		prefetch(rcu_dereference((pos))->next), (pos) != (head); \
        	(pos) = (pos)->next)

struct hlist_head {
	struct hlist_node *first;
};

struct hlist_node {
	struct hlist_node *next, **pprev;
};

#define HLIST_HEAD_INIT { .first = NULL }
#define HLIST_HEAD(name) struct hlist_head name = {  .first = NULL }
#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
static inline void INIT_HLIST_NODE(struct hlist_node *h)
{
	h->next = NULL;
	h->pprev = NULL;
}

static inline int hlist_unhashed(const struct hlist_node *h)
{
	return !h->pprev;
}

static inline int hlist_empty(const struct hlist_head *h)
{
	return !h->first;
}

static inline void __hlist_del(struct hlist_node *n)
{
	struct hlist_node *next = n->next;
	struct hlist_node **pprev = n->pprev;
	*pprev = next;
	if (next)
		next->pprev = pprev;
}

static inline void hlist_del(struct hlist_node *n)
{
	__hlist_del(n);
	n->next = LIST_POISON1;
	n->pprev = LIST_POISON2;
}

static inline void hlist_del_rcu(struct hlist_node *n)
{
	__hlist_del(n);
	n->pprev = LIST_POISON2;
}

static inline void hlist_del_init(struct hlist_node *n)
{
	if (!hlist_unhashed(n)) {
		__hlist_del(n);
		INIT_HLIST_NODE(n);
	}
}

static inline void hlist_replace_rcu(struct hlist_node *old,
					struct hlist_node *new)
{
	struct hlist_node *next = old->next;

	new->next = next;
	new->pprev = old->pprev;
	smp_wmb();
	if (next)
		new->next->pprev = &new->next;
	*new->pprev = new;
	old->pprev = LIST_POISON2;
}

static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
{
	struct hlist_node *first = h->first;
	n->next = first;
	if (first)
		first->pprev = &n->next;
	h->first = n;
	n->pprev = &h->first;
}

static inline void hlist_add_head_rcu(struct hlist_node *n,
					struct hlist_head *h)
{
	struct hlist_node *first = h->first;
	n->next = first;
	n->pprev = &h->first;
	smp_wmb();
	if (first)
		first->pprev = &n->next;
	h->first = n;
}

static inline void hlist_add_before(struct hlist_node *n,
					struct hlist_node *next)
{
	n->pprev = next->pprev;
	n->next = next;
	next->pprev = &n->next;
	*(n->pprev) = n;
}

static inline void hlist_add_after(struct hlist_node *n,
					struct hlist_node *next)
{
	next->next = n->next;
	n->next = next;
	next->pprev = &n->next;

	if(next->next)
		next->next->pprev  = &next->next;
}

static inline void hlist_add_before_rcu(struct hlist_node *n,
					struct hlist_node *next)
{
	n->pprev = next->pprev;
	n->next = next;
	smp_wmb();
	next->pprev = &n->next;
	*(n->pprev) = n;
}

static inline void hlist_add_after_rcu(struct hlist_node *prev,
				       struct hlist_node *n)
{
	n->next = prev->next;
	n->pprev = &prev->next;
	smp_wmb();
	prev->next = n;
	if (n->next)
		n->next->pprev = &n->next;
}

#define hlist_entry(ptr, type, member) container_of(ptr,type,member)

#define hlist_for_each(pos, head) \
	for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \
	     pos = pos->next)

#define hlist_for_each_safe(pos, n, head) \
	for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \
	     pos = n)

#define hlist_for_each_entry(tpos, pos, head, member)			 \
	for (pos = (head)->first;					 \
	     pos && ({ prefetch(pos->next); 1;}) &&			 \
		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
	     pos = pos->next)

#define hlist_for_each_entry_continue(tpos, pos, member)		 \
	for (pos = (pos)->next;						 \
	     pos && ({ prefetch(pos->next); 1;}) &&			 \
		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
	     pos = pos->next)

#define hlist_for_each_entry_from(tpos, pos, member)			 \
	for (; pos && ({ prefetch(pos->next); 1;}) &&			 \
		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
	     pos = pos->next)

#define hlist_for_each_entry_safe(tpos, pos, n, head, member) 		 \
	for (pos = (head)->first;					 \
	     pos && ({ n = pos->next; 1; }) && 				 \
		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
	     pos = n)

#define hlist_for_each_entry_rcu(tpos, pos, head, member)		 \
	for (pos = (head)->first;					 \
	     rcu_dereference(pos) && ({ prefetch(pos->next); 1;}) &&	 \
		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
	     pos = pos->next)

#endif
